Archwire Research Articles

Evaluation of effects of brackets and orthodontic wires on intraoral scans: A prospective in-vivo study.

To evaluate any distortion produced by multibracket fixed orthodontic appliances on digital models obtained from intraoral scans (IOS), considering the presence of both brackets only and brackets/archwire combination. The IOS data of the arches of 20 patients (12 females and 8 males; mean age = 15.55 ± 2.84 years) were acquired using the CS3600 intraoral scanner (Carestream Dental, Atlanta, USA), without any appliances (model A), with vestibular brackets alone (model B) and then with brackets and orthodontic archwire fitted (model C). Data were acquired between the months of January and October 2021 at the moment of indirect bonding phase. On each model, five intra-arch linear measurements were obtained (inter-canine, inter-premolar 1 and 2, inter-molar and arch depth), and after digital matching between model A and B (match 1) and A and C (match 2), the linear discrepancies were evaluated at 20 points (10 occlusal and 10 gingivolingual) previous identified on the reference model A. All measurements were performed using Geomagic Control X software (3D Systems, Morrisville, USA), and any dimensional variations and distortions were evaluated by the linear regression analysis and two-sample t-test (P ≤ .05). The results show an almost perfect correlation between both models B and C and the reference model A, both as regards the intra-arch linear measurements and the linear discrepancies found at the 20 identified points. Multibracket fixed orthodontic appliances do not produce any relevant distortions in digital models obtained via intraoral scanning. Therefore, the removal of archwire is not mandatory before IOS.

Brackets in Orthodontics

Orthodontic brackets are an integral part of traditional braces and act like handles that hold the arch wires that move teeth. There are various types of brackets available, according to the evolution of brackets and composition of brackets, types of locking mechanism.

Thermal Behavior Changes of As-Received and Retrieved Bio-Active® (BA) and TriTanium® (TR) Multiforce Nickel-Titanium Orthodontic Archwires.

Multiforce nickel-titanium (NiTi) orthodontic archwires release progressively increasing forces in a front-to-back direction along their length. The properties of NiTi orthodontic archwires depend on the correlation and characteristics of their microstructural phases (austenite, martensite and the intermediate R-phase). From a clinical and manufacturing point of view, the determination of the austenite finish (Af) temperature is of the greatest importance, as in the austenitic phase, the alloy is most stable and exhibits the final workable form. The main purpose of using multiforce orthodontic archwires is to decrease the intensity of the applied forces to the teeth with a small root surface area, such as the lower central incisors, and also provide forces high enough to move the molars. With the optimally dosed forces of multiforce orthodontic archwires in the frontal, premolar and molar segments, the feeling of pain can be reduced. This will contribute to the greater cooperation of the patient, which is of utmost importance to achieve optimal results. The aim of this research was to determine the Af temperature at each segment of as-received and retrieved Bio-Active® and TriTanium® archwires with dimensions of 0.016 × 0.022 inches, investigated by the differential scanning calorimetry (DSC) method. A classical Kruskal-Wallis one-way ANOVA test and multi-variance comparison based on the ANOVA test statistic using the Bonferroni corrected Mann-Whitney test for multiple comparisons were used. The incisor, premolar and molar segments have different Af temperatures, and they decrease from the anterior to posterior so that the posterior segment has the lowest Af. Bio-Active® and TriTanium® with dimensions of 0.016 × 0.022 inches can be used as first leveling archwires by additional cooling and are not recommended for use on patients with mouth breathing.

Thermal Programming of Commercially Available Orthodontic NiTi Archwires.

The shape of superelastic Nickel-Titanium (NiTi) archwires can be adjusted with thermal treatments using devices such as the Memory-MakerTM (Forestadent), which potentially affects their mechanical properties. The effect of such treatments on these mechanical properties was simulated by means of a laboratory furnace. Fourteen commercially available NiTi wires (0.018″ × 0.025″) were selected from the manufacturers American Orthodontics, Dentaurum, Forestadent, GAC, Ormco, Rocky Mountain Orthodontics and 3M Unitek. Specimens were heat treated using different combinations of annealing duration (1/5/10 min) and annealing temperature (250-800 °C) and investigated using angle measurements and three-point bending tests. Complete shape adaptation was found at distinct annealing durations/temperatures for each wire ranging between ~650-750 °C (1 min), ~550-700 °C (5 min) and ~450-650 °C (10 min), followed by a loss of superelastic properties shortly afterwards at ~750 °C (1 min), ~600-650 °C (5 min) and ~550-600 °C (10 min). Wire-specific working ranges (complete shaping without loss of superelasticity) were defined and a numerical score (e.g., stable forces) was developed for the three-point bending test. Overall, the wires Titanol Superelastic (Forestadent), Tensic (Dentaurum), FLI CuNiTi27 (Rocky Mountain Orthodontics) and Nitinol Classic (3M Unitek) proved to be the most user-friendly. Thermal shape adjustment requires wire-specific working ranges to allow complete shape acceptance and high scores in bending test performance to ensure permanence of the superelastic behaviour.

Effects of wearing fixed orthodontic appliance on dynamic balance, reaction time, and pain perception in adolescents and young adult elite athletes

ABTRACT Objective To investigate the effects of using fixed orthodontic appliance on dynamic balance, auditory/visual reaction times, as well as pain perception in adolescent and young adult elite athletes. Methods A total of 34 elite athletes (n = 19 males) aged 16–21 years from different sports (track and field sprint, long jump and discus throw) were randomly allocated to treatment (n = 17) or control (n = 17) groups. The treatment group received self-ligating brackets with 0.04 cm super-elastic nickel-titanium arch wire, placed in the brackets to correct the teeth position. Perceived pain (i.e., visual analogue scale), dynamic balance (i.e., Y balance test), and auditory reaction time and visual reaction time using Direct RT software were assessed before (day−1), and on five occasions after fixed orthodontic appliance placement (day+1, +3, +7, +14, and +30). The two groups’ quantitative data [expressed as mean (standard deviation)] for each occasion were compared using the Student’s t-test. Comparisons of the Y-balance test, auditory reaction time, visual reaction time, and pain visual analogue scale data were each made between the 6 occasions via a factorial A × B analysis of variance in order to check for the possible interaction between the two groups and the (6) consecutive days (occasions). Results Compared to the control group, the treatment group showed significantly (i) lower values of anterior reach for both the dominant ([78(4) vs. 75(3)%, respectively]) and the non-dominant [76(3) vs. 74(4)%, respectively] legs at day+3, and (ii) higher values of pain visual analogue scale at day+1, day+3, and day+7 [0.00(0.00) vs. 4.94(1.25); 0.00(0.00) vs. 4.12(1.17), and 0.00(0.00) vs. 0.41(0.51), respectively). Factorial analysis of variance revealed that only pain visual analogue scale values were different between the two groups at day+1 and day+3. Conclusion FOA induced a high pain level during the first week following its placement in elite athletes.

Effects of various coating methods on the mechanical, physical, and aesthetic properties of GUMMETAL® archwires: In vitro study

The objective of this study was to evaluate the mechanical, physical, and aesthetic properties of GUMMETAL® (GM) orthodontic archwires after the application of various aesthetic coating materials. This in vitro study included 180 orthodontic wires: five experimental groups used 0.016×0.022-inch GM as the core-based wire followed by the application of epoxy, polytetrafluoroethylene (PTFE), clear ceramic, white ceramic, or silicone; and four control groups: 0.016×0.022-inch GM, 0.019×0.025-inch GM, 0.016×0.022-inch stainless steel (SS), and 0.019×0.025-inch SS. Frictional forces, force deflection rate, yield strength, aesthetic colour value, corrosive and wear resistance were compared between the experimental and control groups. Among the coated wires, white ceramic exhibited the highest frictional force (2.06±0.20N) and silicone showed the lowest values (0.88±0.12N). There were significant differences in static friction between experimental and control groups (P<0.001). PTFE coating had the highest force deflection rate (9.03±0.12N/mm) and yield strength (10.0±0.14N/mm) among coated wires and white ceramic exhibited the lowest values (6.86±0.14N/mm and 7.74±0.17N/mm for force deflection rate and yield strength, respectively). Differences in force deflection rate and yield strength between experimental and control groups were statistically significant (P<0.001). All coated wire groups had a clinical difference in colour when compared to A1 shade. Coated and uncoated wires showed good corrosion resistance after one week in corrosive saliva with no detectable loss of mass. This study has shown that coating wires can improve some aspects of the wire properties but not all when compared to uncoated GM and SS. Future investigation of the materials used in this study is required to further characterize their properties.

Comparison of the Effects of Nano Micelles Curcumin and Ibuprofen on Pain Reduction After Initial Arch Wire Placement: A Double-Blind Randomized Clinical Trial Study

Aim: To compare the effect of nano micelles curcumin and ibuprofen on pain reduction after primary arch wire placement in orthodontic patients. Materials and Methods: In this double-blind randomized clinical trial study, 60 female patients between the ages of 14 and 30 years who had moderate tooth crowding and were candidates for fixed orthodontic treatment were examined. The subjects were divided into four groups ( n = 15) of nano micelles curcumin (SinaCurcumin), ibuprofen, placebo of SinaCurcumin, and placebo of ibuprofen. Each patient received a questionnaire and a rectangular, flexible cube of silicone to record the severity of their pain under each of the three situations (biting posterior teeth together, fitting anterior teeth together, and without fitting the teeth together) at the designated time points (2 h, 6 h, bedtime, the second, third, and seventh days after archwire placement). The obtained outcomes were statistically verified and analyzed by the employment of SPSS Statistics Version 22. Results: despite the lack of any significant differences among the four groups in terms of pain severity upon biting by the anterior teeth 2 h after the intervention, there was a considerable difference in the cases of 6 h, bedtime, and the second, third, and seventh days subsequent of the placement of archwire. Our data indicated a lower rate of pain severity for SinaCurcumin group than the placebo of SinaCurcumin and ibuprofen groups at 6 h after the archwire placement. However, the pain severity of SinaCurcumin group at bedtime was significantly lower than ibuprofen group, which also resulted in a notably lower rate than the other groups at the second, third, and seventh days after the placement of archwire. Conclusion: These findings support the effectiveness of curcumin in reducing the pain severity of orthodontic patients. Nevertheless, it is a necessity to conduct further confirmation trials on this latter.

Assessment of the willingness of Nigerian Orthodontists to offer face-to-face orthodontic services to patients infected with Covid-19.

Efforts to contain the spread of the COVID-19 disease led to suspension of many services which caused orthodontists to resort to providing only emergency services. The aims of this study were to assess the willingness of Nigerian Orthodontists and Orthodontic resident doctors to treat patients infected with Covid-19 as well as to ascertain advice given regarding traumatic arch wires and aligners during the pandemic. This was a descriptive cross-sectional study. We included dentists who were Orthodontists and orthodontic resident doctors practicing in Nigeria. Data was collected via an online questionnaire (Google form) which was sent three times weekly throughout May/June, 2020 and analysed using SPSS version 23. Descriptive statistics were used to analyse the data. Forty-eight out of the 90 members of the WhatsApp group responded within the allotted time, giving a response rate of 53.3%. Out of a total of 48 respondents, 39 (81.3%) were unwilling to treat patients infected with COVID-19 during the pandemic. The major reason was fear of infection with the virus (12, 25.0%). Most of the respondents (41, 55.4%) suggested the use of wax for relief of trauma from arch wires. Majority of Orthodontists and orthodontic residents practicing in Nigeria expressed unwillingness to treat patients infected with COVID-19. Aligner therapy was proffered as an alternative to bracket therapy.

Improved Super-elastic Ti-Ni Alloy Wire for Nonsurgical Treatment of Skeletal Class III Malocclusion Combined with Anterior Crowding and Anterior Crossbite Case

The article reported the use of improved super-elastic Ti-Ni alloy wire (ISW), which was developed by Tokyo Medical and Dental University, to correct a case of skeletal Class III malocclusion combined with anterior crowding and anterior crossbite. An 18-year-old male with a chief complaint of poor dental alignment and protruded lower incisors showed up in our clinic for treatment. Clinical examination revealed skeletal Class III facial profile. Anterior crowding and anterior crossbite could be also noted. Because the patient refused orthognathic surgery, we tried camouflage orthodontic treatment. First, we used ISW crossbite arch to eliminate the anterior interference in order to observe the change of the mandibular position. After that, we use ISW multiloop edgewise arch wire (MEAW) technique and intermaxillary elastics to achieve midline correction and adequate overjet with the bite raising process. The treatment was finished with the improvement of facial appearance and a stable occlusion.

Effect of changing the activation frequency of the arch wires on the pain perception in moderate crowding cases: A randomized controlled clinical trial

Effect of changing the activation frequency of the arch wires on the pain perception in moderate crowding cases: A randomized controlled clinical trial

MANAGEMENT OF ANTERIOR CROSSBITE USING CATLANS APPLIANCE IN THE EARLY MIXED DENTITION PERIOD - A CASE REPORT

In the early mixed dentition period, single tooth anterior crossbite is the commonly encountered problem. Once identified, the treatment modality should be simple, non invasive, involves little chair side time, requires minimal patient cooperation, and gives rapid correction of the crossbite without affecting the surrounding structures. Different treatment options such as removable and fixed appliances have been suggested by various authors in the past literature such as tongue blade therapy, Catlans appliance (lower inclined bite plane), crowns (either stainless steel or composite build-up), Hawleys retainer with double cantilever springs, labial and lingual arch wires. Patient compliance with a removable appliance can often be an issue in young children. This paper presents a case of anterior crossbite corrected using the Catlans appliance within a short period of three weeks without any damage to the tooth or the periodontium. This fixed appliance is a simple and economical method which does not depend on patient cooperation to reverse the bite.

A Novel Coating of Orthodontic Archwires with Chlorhexidine Hexametaphosphate Nanoparticles.

A solution of CHX-HMP nanoparticles with an overall concentration of 5 mM for both CHX and HMP was prepared, characterized (using atomic force microscope and Fourier transformation infrared spectroscopy), and used to coat orthodontic stainless steel (SSW) and NiTi archwires (NiTiW). The coated segments were characterized (using scanning electron microscopy SEM with energy dispersive X-ray spectrometry and field emission SEM) and subjected to the elusion assessment. After having their composition validated, the average size of the CHX-HMP NPs was assessed to be 51.21 nm, and the analysis revealed that the particles had both chlorine and phosphorus. After 30 minutes in the coating solution, NPs deposited on the surface of the SSW and NiTiW. A continuous release of soluble CHX in artificial saliva was detected from both SSW and NiTiW as long as the experiment lasted for 28 days without reaching a plateau. However, the release from coated NiTiW was significantly more than coated SSW at 7, 14, and 28 days. While at day 21, the release from coated SSW was slightly greater than that from the coated NiTiW. Orthodontic stainless steel and NiTi archwires can be successfully coated with CHX-HMP NPs and give sustained release of CHX along the examined period.

Evaluation of effectiveness of low level laser therapy in accelerating orthodontic tooth movement-An in vivo study

To assess the acceleration of tooth movement in canine retraction and to assess the interleukin 1β level in Gingival Crevicular Fluid. 0.022 slot MBT brackets, 0.018 inch stainless steel arch wire, Low level laser (Gallium-Aluminium-Arsenide Laser), ELISA kit, Micro-capillary tube, Digital Vernier calliper, Dontrics gauge, NiTi closed coil springs Open labelled split mouth, non-experimental interventional institutional based study. By coin toss method, each of the participant’s mouth was randomly assigned either to the laser therapy (group 1) and 40 reference sites (group 2). On the experimental site orthodontic treatment with fixed appliance, a combination with low level laser therapy (Gallium-Aluminium-Arsenide laser) to the canine on the days 3,7,14 and then every 15 days for 2 months was initiated. Then 5µL of Gingival Crevicular Fluid (GCF) was collected to analyse the interleukin 1β levels using the ELIZA kit. The measurements were made with the help of a digital Vernier calliper. The laser group showed a significant greater reduction in the canine to molar distance than the site treated with conventional technique. The interleukin 1 β levels raised significantly for the site treated with laser as compared to the other. We observed that: Increased inflammatory response in the form of raised interleukin levels and Faster distalization of the canine when adjunct with low level soft tissue laser. The entire data was statistically analyzed using Statistical Package for Social Sciences (SPSS version 21.0, IBM Corporation, USA) for MS Windows. In Statistics, unpaired t-test is a used to compare equality of two population means and F-test is used to compare the equality of two population variance using that the samples were drawn from different populations. There was a clinically appreciable amount of retraction seen resulting in faster space closure between the canine and the first permanent molar in the group that had low level laser than the other group that was treated by the conventional therapy. We also observed a considerable rise in the interleukin 1 β levels in the laser group.

Modified bracket holder with magnifying lens: A precise bracket positioner

Awell finished orthodontic case is a result of precise bracket positioning during initial bonding. Orthodontists strive for accurate positioning of brackets so that we can avoid / minimize finishing arch wire bends. During the Bonding procedure, placing the bracket on tooth surface and then adjusting it to ideal position is time-consuming, also bracket displacement will reduce the bond strength. Therefore, to avoid these drawbacks this modified bracket holder with magnifying lens gives magnified image of tooth surface with precise visibility, so that bracket placement can be accurate according to the tooth contour with respect to mesio –distal and vertical position of tooth.

Finite Element Analysis of Maxillary Teeth Movement with Time during En Masse Retraction Using Orthodontic Mini-Screw

Introduction: The aim of this study was to determine the placement of an orthodontic mini-screw (OMS) and the length of an anterior retraction hook (ARH) with en masse retraction. Continuous maxillary tooth movement pattern was simulated by finite element analysis (FEA). Materials and methods: Extraction of the first premolar was hypothesized with a finite element model. The placement of OMS was analyzed for the following two groups: (1) a high OMS (HOMS) group with OMS placed horizontally at the mesial side of the second premolar and apically 10 mm above the arch wire, and (2) a low OMS (LOMS) group with OMS placed horizontally between the second premolar and the first molar and apically 8 mm above the arch wire. According to the height of ARH, each group was divided into three subgroups. Results: When the extraction space of the first premolar was closed, anterior teeth were intruded in the HOMS group but extruded in the LOMS group. In all cases, the first molar was intruded. According to the intrusion of the first molar and extrusion of anterior teeth, the occlusal plane rotated clockwise (CW) in the LOMS group. However, in the HOMS1 group, the occlusal plane rotated counterclockwise (CCW) due to more intrusion of anterior teeth than that of the first molar. Conclusion: By analyzing six cases of different OMS and ARH, changes of incisor and molar in en masse retraction with the extraction of the first premolar could be predicted. In addition, OMS placement and ARH length can be determined based on results of incisal showing. This study can also help esthetic orthodontic results.

Treatment of Severe Anterior Open-bite Accompany with Impacted Canine: A Case Report

Introduction: The anterior open bite is a multifactorial malocclusion and a challenge between orthodontists. Based on the origin, divided in two types as dental and skeletal, and appear in the anterior or posterior segments, (unilateral or bilateral). Dental open-bite in the most of patients have environmental etiologic factor such as oral habits, tongue trust, mouth breathing, large tongue. In skeletal type, excessive vertical growth of the maxilla is etiologic factor and accompany with downward-backward rotation of the mandible.Case Report: The case was a 27 years woman with an anterior open bite and unilateral impacted upper canine and congenital missing of lower 2nd premolar in the left side and retained 2nd lower deciduous molar and upper canine in the left side. She consulted for orthodontic treatment in Tehran Dental School of Shahid Beheshti University of Medical Sciences in October of 2017.The Orthodontic treatment was down with MBT slot 22 system (USA. Orthoorganizer, inc) for apply extrusive force on impacted upper canine in left side with auxiliary 014 ss, segmented arch wire. loop arch wire technique with 16 × 22 ss rectangular continuous arch wire was used for space closing in extraction site and correction overbite. The extracted teeth were right lower 2nd premolar and left 2nd deciduous molar and 1st premolars in upper arch. As recommended advancement genioplasty for correction chin deficiency the patient refused it. Conclusion: In this technique we used Orthodontic treatment alone instead of Orthognathic surgery for open bite correction.

Leveling the curve of Spee using different sized archwires: a randomized clinical trial of blood flow changes

ObjectivesTo compare blood flow (BF) changes of teeth subjected to orthodontic forces during curve of Spee (COS) leveling using different archwires (AW).Material and methodsThirty subjects with COS > 5 mm were randomly assigned (1:1:1) into three groups based on the AW used: group 1: 0.017 × 0.025-inch stainless-steel (SS)AW, group 2: 0.019 × 0.025-inch SSAW, and group 3: 0.021 × 0.025-inch β-titanium (TMA)AW. In the 3 groups, a 5 mm-depth reverse COS was placed in the AWs. A laser Doppler flowmeter was used to measure BF at different time intervals (T0–T4).ResultsIn the 3 AWs group, BF of all measured teeth was reduced 20 min after force application. Afterwards, the BF values started to increase until the baseline values were almost restored within 1 week. Differences in BF changes between the extrusion and intrusion subgroups were observed within groups 1 and 3 during the first 20 min of force application (P < 0.05). Similar BF changes were recorded using the 3 different AWs. BF changes were associated with tooth type and the amount of COS depth change.ConclusionsDuring CoS leveling, similar BF changes were recorded using the 3 different AWs. Tooth type and the amount of COS depth change were associated with BF changes within the first 20 min of force application. Greater BF reduction was found in premolars compared to incisors during the first 20 min of AW placement.Clinical relevanceIt is important to select a type of applied forces that minimally affect the BF. Intrusive forces appeared to have lower negative effects on the BF of teeth during COS leveling.Trial registrationClinicalTrial.gov (# NCT04549948).

Effect of Fluoride Content of Mouthwashes on the Metallic Ion Release in Different Orthodontics Archwires.

Metal ion release studies were carried out on three of the most commonly used orthodontic wires in the clinic: austenitic stainless steel, Ti-Mo, and superelastic NiTi, using three mouthwashes with different fluoride concentrations: 130, 200, and 380 ppm. Immersions were carried out in these mouthwashes at 37 °C for 1, 4, 7, and 14 days, and the ions released were determined by inductively coupled plasma-mass spectrometry (ICP-MS). All wires were observed by scanning electron microscopy (SEM). The results showed a moderate ion release in the stainless steel wires, with nickel and chromium values of 500 and 1000 ppb in the worst conditions for the wires: concentrations of 380 ppm fluoride and 14 days of immersion. However, in the Ti-Mo and NiTi alloys, an abrupt change in release was observed when the samples were immersed in 380 ppm fluoride concentrations. Titanium releases in Ti-Mo wires reached 200,000 ppb, creating numerous pits on the surface. Under the same conditions, the release of Ni and Ti ions from the superelastic wires also exceeded 220,000 ppb and 180,000 ppb, respectively. This release of ions causes variations in the chemical composition of the wires, causing the appearance of martensite plates in the austenitic matrix after 4 days of immersion. This fact causes it to lose its superelastic properties at a temperature of 37 °C. In the case of immersion in 380 ppm mouthwashes for more than 7 days, rich-nickel precipitates can be seen. These embrittle the wire and lose all tooth-correcting properties. It should be noted that the release of Ni ions can cause hypersensitivity in patients, particularly women. The results indicate that the use of mouthwashes with a high content of fluoride should not be recommended with orthodontic archwires.

Surface Characterization of Stainless Steel 316L Coated with Various Nanoparticle Types.

Material tribology has widely expanded in scope and depth and is extended from the mechanical field to the biomedical field. The present study aimed to characterize the nanocoating of highly pure (99.9%) niobium (Nb), tantalum (Ta), and vanadium (V) deposited on 316L stainless steel (SS) substrates which considered the most widely used alloys in the manufacturing of SS orthodontic components. To date, the coating of SS orthodontic archwires with Nb, Ta, and V using a plasma sputtering method has never been reported. Nanodeposition was performed using a DC plasma sputtering system with three different sputtering times (1, 2, and 3 hours). Structural and elemental analyses were conducted on the deposited coatings using XRD, FESEM, and EDS showing a unique phase of coating metals over their substrates with obvious homogeneous even deposition. A highly significant positive correlation was found between sputtering time and thickness of the achieved coatings. AFM revealed a reduction in the surface roughness of 316L SS substrates sputtered with all coating materials, significantly seen in V coatings. Sputtering time and coating material play a significant role in terms of microstructure and topography of the achieved coatings being the best in the Ta group; moreover, surface roughness was significantly improved by V coatings. Likewise, it is found to be sputtering time independent for all used coatings.

Effect of motivational interviewing on oral and dental health of adolescents with fixed orthodontic appliances

Introduction: Orthodontic appliances increase the risk of dental caries and gum disease. Since it is rather difficult to maintain oral hygiene in patients with fixed orthodontic appliances due to the presence of brackets, bands, and arch wires, they should be persuaded to take care of their oral cavity. Therefore, the present study was conducted to evaluate the effect of an oral and dental health educational intervention using motivational interviewing in adolescents with fixed orthodontic appliances.&#x0D; Materials and Methods: Thirty adolescents with fixed orthodontic appliances aged 12-16 years presenting to orthodontics departments of school of dentistry, Tehran University of Medical Sciences, received individual counselling, verbal guidelines, and training for correct brushing and flossing techniques by a senior student of dentistry during a 20-minute motivational interview. To evaluate the effect of the intervention, oral health behaviors including brushing, flossing, and consumption of sugary snacks were collected in a self-report manner. Moreover, plaque and gingival indexes were measured before and one-month post intervention. The SPSS software version 23 was used for data analysis.&#x0D; Results: Among oral health behaviors, optimal frequency of brushing increased after the intervention (p=0.002). The mean plaque index was 0.99±0.43 before and 0.37±0.16 after the intervention, indicating a significant difference (p&lt;0.001). Moreover, the mean gingival index (average inflammation) was 0.99±0.56 before the intervention, which improved to 0.30±0.20 after the intervention (p&lt;0.001).&#x0D; Conclusion: Educational intervention based on motivational interviewing reduced dental plaques and gingival inflammation and increased the frequency of brushing in the short term among adolescents with fixed orthodontic appliances.